Answer:
Thawing
Explanation:
The food is thawing when you just leave it out
Blood in the pulmonary vein is oxygen rich, while in all of the other veins, it is oxygen poor.
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Explanation:
<h2>1.tubberculosis </h2>
prevention: by vaccination
signs and symptoms :fever, chills losing of eating appetite
<h2>2.Hiv and aids</h2>
prevention : abstinence , avoid deep kissing
signs fever, loss of weight